Measure the dew point and humidity with an Arduino-based Chilled Mirror Hygrometer.
Project tutorial by schouten_tjeerd
A hard disk platter is a good idea. Won't it oxidize though? I also want to place a PRT in the mirror for the next version so I need to drill a hole in the side, which means it has to be thick enough. Either way, it is a good idea and will give it a try.
Thanks for the kind words :-)
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